diff --git a/Content/Shaders/GI/GlobalSurfaceAtlas.flax b/Content/Shaders/GI/GlobalSurfaceAtlas.flax
index 113c96beb..5fb11c46a 100644
--- a/Content/Shaders/GI/GlobalSurfaceAtlas.flax
+++ b/Content/Shaders/GI/GlobalSurfaceAtlas.flax
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:16457c650f2c3f2e04356e579423ccf8cba776555409af7cbaf8f4dec407c1db
-size 12835
+oid sha256:b0acbc356eb19ea1cdcc131df43074578d3f5a2b2673d7ec52c3619e39ec080a
+size 12945
diff --git a/Source/Engine/Renderer/GI/GlobalSurfaceAtlasPass.cpp b/Source/Engine/Renderer/GI/GlobalSurfaceAtlasPass.cpp
index c56b1ec23..716e6e8ee 100644
--- a/Source/Engine/Renderer/GI/GlobalSurfaceAtlasPass.cpp
+++ b/Source/Engine/Renderer/GI/GlobalSurfaceAtlasPass.cpp
@@ -268,11 +268,15 @@ bool GlobalSurfaceAtlasPass::setupResources()
 
     // Create pipeline state
     GPUPipelineState::Description psDesc = GPUPipelineState::Description::DefaultFullscreenTriangle;
-    if (!_psDebug)
+    if (!_psDebug0)
     {
-        _psDebug = device->CreatePipelineState();
-        psDesc.PS = shader->GetPS("PS_Debug");
-        if (_psDebug->Init(psDesc))
+        _psDebug0 = device->CreatePipelineState();
+        _psDebug1 = device->CreatePipelineState();
+        psDesc.PS = shader->GetPS("PS_Debug", 0);
+        if (_psDebug0->Init(psDesc))
+            return true;
+        psDesc.PS = shader->GetPS("PS_Debug", 1);
+        if (_psDebug1->Init(psDesc))
             return true;
     }
     if (!_psClear)
@@ -327,7 +331,8 @@ void GlobalSurfaceAtlasPass::OnShaderReloading(Asset* obj)
     SAFE_DELETE_GPU_RESOURCE(_psDirectLighting0);
     SAFE_DELETE_GPU_RESOURCE(_psDirectLighting1);
     SAFE_DELETE_GPU_RESOURCE(_psIndirectLighting);
-    SAFE_DELETE_GPU_RESOURCE(_psDebug);
+    SAFE_DELETE_GPU_RESOURCE(_psDebug0);
+    SAFE_DELETE_GPU_RESOURCE(_psDebug1);
     invalidateResources();
 }
 
@@ -345,7 +350,8 @@ void GlobalSurfaceAtlasPass::Dispose()
     SAFE_DELETE_GPU_RESOURCE(_psDirectLighting0);
     SAFE_DELETE_GPU_RESOURCE(_psDirectLighting1);
     SAFE_DELETE_GPU_RESOURCE(_psIndirectLighting);
-    SAFE_DELETE_GPU_RESOURCE(_psDebug);
+    SAFE_DELETE_GPU_RESOURCE(_psDebug0);
+    SAFE_DELETE_GPU_RESOURCE(_psDebug1);
     _cb0 = nullptr;
     _shader = nullptr;
 }
@@ -1091,7 +1097,7 @@ void GlobalSurfaceAtlasPass::RenderDebug(RenderContext& renderContext, GPUContex
     context->BindSR(4, bindingData.Objects ? bindingData.Objects->View() : nullptr);
     context->BindSR(6, bindingData.AtlasDepth->View());
     context->BindSR(7, skybox);
-    context->SetState(_psDebug);
+    context->SetState(_psDebug0);
     {
         Float2 outputSizeThird = outputSize * 0.333f;
         Float2 outputSizeTwoThird = outputSize * 0.666f;
@@ -1123,19 +1129,20 @@ void GlobalSurfaceAtlasPass::RenderDebug(RenderContext& renderContext, GPUContex
         context->BindSR(6, bindingData.AtlasDepth->View());
         context->BindSR(7, skybox);
         context->BindCB(0, _cb0);
-        context->SetState(_psDebug);
         context->SetRenderTarget(output->View());
 
         // Disable skybox
         data.SkyboxIntensity = 0.0f;
         context->UpdateCB(_cb0, &data);
 
-        // Bottom left - diffuse
+        // Bottom left - diffuse (with missing surface coverage debug)
+        context->SetState(_psDebug1);
         context->BindSR(5, bindingData.AtlasGBuffer0->View());
         context->SetViewportAndScissors(Viewport(outputSizeTwoThird.X, 0, outputSizeThird.X, outputSizeThird.Y));
         context->DrawFullscreenTriangle();
 
         // Bottom middle - normals
+        context->SetState(_psDebug0);
         context->BindSR(5, bindingData.AtlasGBuffer1->View());
         context->SetViewportAndScissors(Viewport(outputSizeTwoThird.X, outputSizeThird.Y, outputSizeThird.X, outputSizeThird.Y));
         context->DrawFullscreenTriangle();
diff --git a/Source/Engine/Renderer/GI/GlobalSurfaceAtlasPass.h b/Source/Engine/Renderer/GI/GlobalSurfaceAtlasPass.h
index 9e1a1feb1..87f7d84c1 100644
--- a/Source/Engine/Renderer/GI/GlobalSurfaceAtlasPass.h
+++ b/Source/Engine/Renderer/GI/GlobalSurfaceAtlasPass.h
@@ -50,7 +50,8 @@ private:
     GPUPipelineState* _psDirectLighting0 = nullptr;
     GPUPipelineState* _psDirectLighting1 = nullptr;
     GPUPipelineState* _psIndirectLighting = nullptr;
-    GPUPipelineState* _psDebug = nullptr;
+    GPUPipelineState* _psDebug0 = nullptr;
+    GPUPipelineState* _psDebug1 = nullptr;
     GPUConstantBuffer* _cb0 = nullptr;
     GPUShaderProgramCS* _csCullObjects;
 
diff --git a/Source/Shaders/GI/GlobalSurfaceAtlas.hlsl b/Source/Shaders/GI/GlobalSurfaceAtlas.hlsl
index 0fa43d451..deff969a3 100644
--- a/Source/Shaders/GI/GlobalSurfaceAtlas.hlsl
+++ b/Source/Shaders/GI/GlobalSurfaceAtlas.hlsl
@@ -11,6 +11,14 @@
 #define GLOBAL_SURFACE_ATLAS_TILE_NORMAL_THRESHOLD_ENABLED 0 // Enables using tile normal threshold to prevent sampling pixels behind the view point (but might cause back artifacts)
 #define GLOBAL_SURFACE_ATLAS_TILE_NORMAL_THRESHOLD 0.05f // Cut-off value for tiles transitions blending during sampling
 #define GLOBAL_SURFACE_ATLAS_TILE_PROJ_PLANE_OFFSET 0.1f // Small offset to prevent clipping with the closest triangles (shifts near and far planes)
+#ifndef GLOBAL_SURFACE_ATLAS_DEBUG_MODE
+// 0 - disabled
+// 1 - atlas coverage (pink for missing surface data)
+#define GLOBAL_SURFACE_ATLAS_DEBUG_MODE 0
+#elif GLOBAL_SURFACE_ATLAS_DEBUG_MODE == 1
+#define GLOBAL_SURFACE_ATLAS_TILE_NORMAL_WEIGHT_ENABLED 0
+#define GLOBAL_SURFACE_ATLAS_TILE_NORMAL_THRESHOLD 0
+#endif
 
 struct GlobalSurfaceTile
 {
@@ -268,6 +276,11 @@ float4 SampleGlobalSurfaceAtlas(const GlobalSurfaceAtlasData data, ByteAddressBu
         }
 #endif
     }
+ 
+#if GLOBAL_SURFACE_ATLAS_DEBUG_MODE
+    if (result.a < 0.05f)
+        result = float4(1, 0, 1, 1);
+#endif
 
     // Normalize result
     result.rgb /= max(result.a, 0.0001f);
diff --git a/Source/Shaders/GI/GlobalSurfaceAtlas.shader b/Source/Shaders/GI/GlobalSurfaceAtlas.shader
index a9375e105..730ecc9ef 100644
--- a/Source/Shaders/GI/GlobalSurfaceAtlas.shader
+++ b/Source/Shaders/GI/GlobalSurfaceAtlas.shader
@@ -302,6 +302,8 @@ TextureCube Skybox : register(t7);
 
 // Pixel shader for Global Surface Atlas debug drawing
 META_PS(true, FEATURE_LEVEL_SM5)
+META_PERMUTATION_1(GLOBAL_SURFACE_ATLAS_DEBUG_MODE=0)
+META_PERMUTATION_1(GLOBAL_SURFACE_ATLAS_DEBUG_MODE=1)
 float4 PS_Debug(Quad_VS2PS input) : SV_Target
 {
 #if 0